The irrigation and different rates of nitrogen and potassium in elephant grass production

  • Jair da Costa Oliveira Filho Universidade Federal de Tocantins
  • Ednaldo Miranda de Oliveira Universidade Federal de Viçosa
  • Rubens Alves de Oliveira Universidade Federal de Viçosa
  • Paulo Roberto Cecon Universidade Federal de Viçosa
  • Reginaldo Miranda de Oliveira Universidade Federal de Viçosa
  • Antônio Carlos Cóser Embrapa
Keywords: forage yield, pasture irrigation, fertilization with nitrogen


The objective of this study was to evaluate the effects of application of different irrigation and nitrogen (N), and potassium (K) in Xaraes grass yield in southern Tocantins. We used a mixture of fertilizer, so that combinations of N and K2O relationship of 1 N:0.8 K2O. To assess the effect of different depths of irrigation water and combinations of the concentrations of N and K2O Xaraes the grass was determined during the experiment the dry matter yield. The lowest yield in the dry season was of 4,486 kg ha-1, with the 100 kg ha-1 yr-1 N: 0.8 K2O, in the absence of irrigation, while the highest yield was of 9169 kg ha-1 at a dose of 700 kg ha-1 yr-1 N:0.8 K2O and water depth of 120% ETc, resulting in increased productivity of dry matter. The highest yield in the same period was 11,333 kg ha-1, with the application of the estimated maximum dose of 576.7 kg ha-1 N:0.8 K2O and the water depth of 120% of ETc, resulting in an increase 50 the dry period increased by 104% in the productivity of Xaraes grass with increasing rate of the mixture of N and K2O and the water depth. In the rainy season, there was a 50% increase in yield of Xaraes grass with increasing dose of N and K2O.